209002109 has 4 divisors (see below), whose sum is σ = 220002240. Its totient is φ = 198001980.

The previous prime is 209002049. The next prime is 209002111. The reversal of 209002109 is 901200902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209002109 is a prime.

It is a Duffinian number.

209002109 is a modest number, since divided by 2109 gives 209 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209002609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5500037 + ... + 5500074.

It is an arithmetic number, because the mean of its divisors is an integer number (55000560).

Almost surely, 2^209002109 is an apocalyptic number.

It is an amenable number.

209002109 is a deficient number, since it is larger than the sum of its proper divisors (11000131).

209002109 is a wasteful number, since it uses less digits than its factorization.

209002109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11000130.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 209002109 is about 14456.9052359072. The cubic root of 209002109 is about 593.4492101739.

The spelling of 209002109 in words is "two hundred nine million, two thousand, one hundred nine".